She has a couple of correspondents who are on WebTV. If either of them sends her an email that is Forwarding another email, the forwarded xxx.eml will not open (that is, be displayed) in TB. The attached .eml can only be read by copying (or detaching) it to another folder, from whence it will open in Outlook Express. The setting of TB option 'View > Display Attachments Inline' is irrelevant.
This occurs only with WebTV-sent emails. All her other attachments work just fine.
A Google search did find this item, which seems pertinent even though it is OE that is addressed.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.12) Gecko/20070508 Firefox/1.5.0.12
